Recoil-absorbing device for firearms



N.IJ. A. GALLIOT AND G. H. L. G. BORAY.

RECOIL ABSORBING DEVICE FOR FIREARMS.

APPLICATION HLED MAR. 22.1919- Patented Mar. 9,1920.

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NORBERT JULES DRE GALLIOT, 0F COURBEVOIE, AND GEORGES HENRI LOUIS GASTONBORY, 0F PARIS, FRANCE.

RECOIL-ABSORBING DEVICE FOR FIREARMS.

Specification of Letters Patent.

Patented Mar. 9%, 1920.

Application filed March 22, 1919. Serial No. 284,454.

To all whom it may concern:

Be it known that we, NORBERT JULEs ANDRE GALLIOT, a citizen of theRepublic of France, and a resident of 3 Rue Auguste Bailly, Courbevoie,France, and GEORGES HENRI LOUIS GASTON BORY, a citizen of the Republicof France, and a resident of 17 Rue de la Trmoille, Paris, France, haveinvented a new and useful Recoil-Absorbing Device for Firearms, of whichthe following is a specification.

The present invention relates to an improvement in the recoil-absorbingdevice for fire-arms which consists of a divergent orconvergent-divergent expanding nozzle fixed to the end of the barrel ofthe 'firearm and co-axially thereto so as to increase the kinetic energyof the gases which are then turned aside and directed externally towardthe rear by means of a fixed guidevane connected to the'nozzle andgenerated by the revolution of an are around the'axis of the latter.

A recoil-absorbing device of this kind for fire-arms is described andrepresented in our United States patent application, filed April 10,1918, Serial Number 227,7 90.

It has been found that the gases directed back in a direction more orless oblique in relation to the axis of the fire arm have retained aportion of their velocity and constitute an inconvenience or even adanger for the personal serving, or the user of, the fire-arm providedwith this device.

The present invention allows the elimination of this inconvenience bytransforming the conical stream of gas having a rapid translatorymovement directed substantially backward, into a flow of vortices inwhich the molecules of gas possess a rotary or eddying motion in a zoneperpendicular to the axis of the fire-arm, this transformation takingplace in the vicinity of the orifices- 0 for the passage of theprojectile, this bore 0 having grooves 0 so (as to prevent or re duceconsiderably the escape of gas during the moment when the projectile ispassing through this bore, with suflicient clearance for the projectilenot to be influenced during its passage. The obturator comprises on theside facing the fire-arm, a gullet 0 generated by the revolution of aparabolic are around the longitudinal axis w-y of the nozzle and of thebarrel; there is obtained in this way an arrangement analogous to aturbine-vane or guide-blade which deflects the streams of gas at theirmaxi mum speed with the least possible friction. The rear edge of thenozzle a also has an analogous curvature at a starting from the frontextremity'or lip of the latter, that is from the point A.

vThe streams of gas escape to the exterior shaped as to present theleast p ssible rc-' sistance to the flow of the gases; the reaction uponthe guide-vane due to the kinetic energy of the gases operates to reducethe force of recoil of the fire-arm and may even balance it.

Instead of giving to the arc, which generates the guiding surface byrevolution around the axis m3 of the barrel and of the nozzle, aparabolic shape according to the single curve B C D, as 1n the earlierspecification mentioned above (which causes the gases to be rejectedbackward in a direction oblique in relation to the axis ww) this are isgiven a double curvature B C D; the portion B C of the parabolic curvehas been retained up to the point C, but this arc is continued by acurve of opposite direction C D; the point C where the inversion of thecurve takes lace is determined by the intersection with t e paraboliccurve B C D of'a straight line making at A an angle a of to 60 degreeswith the internal generatrix of the nozzle. l g

The curve B C D thus obtained instead of continuing around or developingthe lip a of the nozzle a, leaves between the nearest points of this lipof and of the ide surface 0, between the planes perpendicular to theaxis w-y passing through these points, an

appreciable space for the passage of the gaseous streams;

With a guide-surface presenting this tively localized zone substantiallyperpendicular to the axis w y of the fire-arm near these orifices a theoperation of the device as recoil-absorber is in no way aflected.

It has been found that when the angle a is less than 35 degrees, theoperation diminishes as regards thereduction of the recoil; beyond 60degrees, the result is' better than with an enveloping guide-vaneof thesingle curvature B C D but the eddying of the gaseous streams is lessenergetically produced. It is evident that in every particular casethere should be considered, according to the type of fire-arm, caliber,etc., the most favorable shape for the doubly-curvedarc of theguide-vane, the dimensions of the nozzle, etc. i

, Having now particularly described and as-- certained the nature of oursaid invention and in what manner the same is to be performed, wedeclare that what we claim is 1. A recoil deadener for guns comprisingan expansion nozzle secured in extension of and co-axial with the gunmuzzle, an end closure for the nozzle having a central opening for thepassage of a projectile therethrough, and a reflexed lateral gas escapechannel, the discharge mouth of which is flared to direct thereflexedstream of escaping gases into a; zone lying substantially at rightangles to the axis of the nozzle.

'2; A recoil deadener for guns comprising an expansion nozzle secured inextension of and co-axial with the gun muzzle, an end closure for thenozzle having a central opening 'for the passage of a projectiletherethrough,

and a reflexed lateral gas escape channel, the forward wall of whichterminates in a revers'ed curve serving to direct the reflexed stream ofescaping gases into a zone lyin substantially at right angles to theaxis 0 the nozzle.

3. A recoil deadener forguns comprisin an expansion nozzle secured inextension 0 and co-axial with the gun'muzzle, an end closure for thenozzle having a central opening for the passage of a projectiletherethrough,

and a reflexed lateral as escape channel, the

discharge mouth of w ich is flared to direct the reflexed stream ofescaping gases into a zone lying substantially at right angles to theaxis of the nozzle, the point of inversion of the curve lying at anangle of at least 35 degrees to the wall of the nozzle, and the apex ofsaid angle being situated at the lip" of the'nozzle. a

In testimony whereof we have signed our names to this specification.

NORBERT JULES ANDRE armor. aromas HENRI LOUIS GASTON'BORYJ WitnessesCHAR ES DONY,

A. DEFEVRIMON'L-

